Push-button electric switch.



PUSH BUTTON ELECTRIC SWITCH.

- APPLICATION FILED MAR.22,1911.

1,03 ,2 4, Patented Sept. 10,1912.

1%)? ssas UNITED sT 'rEs Hermann omen, or rnanxronr-on-rnn -MAIN,' GERMANY, nssrcnon TO THE rim/r OF HARTMANN & BRAUN A.-G., OF FRANKFORT-ON-THE-MAIN, GERMANY,

PUSH-BUTTON ELECTRIC SWITCH.

Specification oflctters ?atent. I

Patented Sept. 10, 1912.

Application filed March 22, 1911. Serial No. 616,170. g

To all whom it may concern:

'Be it known that I, HERMANN CAHEN, a citizen of the German Empire, and residing at Frankfort-on-the-llllain, HQSS-N21S 5 sau, Prussia, Germany, have invented.cer

tain .new and useful Improvements in Push- Bntton Electric Switches, of which the following is a specification.

A push-button switch constructed according to my improved method is represented in vertical section in Figures 1 and 2 of the accompanying drawings the latter view being taken at right angles to that of the former; while Figs. 3 aud t are views, on

an enlarged scale, of a special detail hereinafter more particularly referred to.

In order to make the method of working readily understood it will be assumed that the fixed contact K has been removed. If

now the push-button D be pressed down, the contact K, will" pass through the course (5-?) shown by the dotted arr'ow in Fig.1;

. and on releasing the push-button, the'latter .will be moved up again by the reaction of the spring F; K, passing back through the game course but in the reverse direction The contact spring F is employed for the purpose of forming a contact with the terluinal K, and is so arranged in the track 0-), that on pressing down the button, the contact K, will first be driven against the contact K and on being pressed farther down will slide off the contact K so that, on releasing the pressure, the spring F, tc--- gethcr with the contact K,, will again return'to their initial position. For this purpose, K, ismade of; the shape shown in Figs. -1 and 2 and, on a larger scale, in Fig. 3,

40 which slfape will bereadily understood if the movement of the contact K, consequent on this shape be examined (see Fig. On

' ressing down the push-button, the, contact the initial position a alongthe original track a-b until .the lowest point of K, arrives in contact with a trough-shaped layer of insulating material J whereupon it is forced to slide along the same up to the point '1 and thence along the is firstn ovcd from 5 0 front edge of J, up to lhc point 2. lnasmuch-as the spring F is placed under tens10n owmg to this forced deviation from its original track a-Inthe contact K,. as soon as it leaves the edge of J,, fiies along the course 2-3 againstthe actual contact sur-. face is, and on releasing the pressure rests firmly against the upper curving of this surface. In this position the circuit is closed. On further pressing down for the purpose of switching otl, the contact K, slides fronrthe point t o er 3 along the surface is until at point 5 it reaches the opening 0 (Fig. 2), when it again fiiesback owing to the action of the spring F to the end point I) of the original track and thus the circuit is momentarily interrupted. It now the pnsh-button be released then the contact K, will slide back into its' original position a, whereby it is prevented from forming any metallic contact with L by reason of the insulating layer J being proowing to the shape of the opening 0 as shown in Fig. 2, has unhindered passage through the contact K In Fig. '2 for the sake of clearriess the contact L, is shown curved somewhat upward.

described for the regular switching on and switching off. It has, however, the disadvantage that, on rapidly pressing down thebutton D, the contact easily slides through the opening 0, and again interrupts the cir cuit after short contact with the surface k. In order to prevent this, according to Fig.

terial is provided and, catching the contact sliding cit the point 2 forces it first to slide along the surface J up to the point- Ql On releasing the pressure, the switching-on is then efi'ected along the course 2'2--3 and the locking of the contact K, inthe closed position of the current is effected at the newed pressure on the but-ton in the same way as in Fig. 3.

Theessentialfeature in the rormation of when switching-on, the contact K, is first guided front the contact K, against the 'zn-tionqof the spring, in order then to be driven against it; and in that. when switching-oft. the. spring is again placed under. tension by a similar guided movement. and the current is momentarily interrupted.

For the sake of greater clcarncss, the portions of the course in which the movement of the contact is positive are shown hatched 4, a special step J of suitable insulating ma-' longed hackward The spring F itself,

This device would suflice in the manner point l. The switching-Mi is effected by re the contact K consequently consists in that ment are shown in thick -dtitted lines.

ton D isjorced hyaspiral spring S to folposit-ion whether'the switch is switched on any other positive connection tween the push-button-fl) and the spring" F may be I emplo'yed.-;;= -.1

low the "movement of the flat spring F, in' order thus to be ableto reco 1ze ,trom its or off. Instead of providing a s iral spring,

Now, what I claim is I 1. In a push button eleeti ic switch, a base terminal plates, the other terminal plate bemg inclined toward the contact spring,

and provided with a hooked end 'portion and an opening, said opening corresponding ,to the enlarged free end port-ion of the contact spring to permit 'the latter to pass therethrough, insulation on the hookedwend portion of the inclined terminal plate, a cas. .mgLand apu sh button for operating the contact spring.-

'3. In a push button electric switch, a base member, a switch mechanism comprising terminal plates mounted upon the base member, a movable contact spring-mountedon one of the terminal plates, insulation on the Qooked' end portion of the other of said erminal plates, a] wall of insulating material secured to,the base of the latter ter.- minal plate and diverging upwardly there from, said wall of insulation terminating short/of the insulation on. the hooked end portion. of the plate, a casing, and a push button provided with means to cause it to follow the contact spring. 55

In testimony whereof I have afiixed my signature in presence of two witnesses;

. GAHEN.

member,'- a switch mechanism comprising terminal plates mounted upon the base memher, a contact spring having an. enlarged free end portion and secured to one of said -terminal plates, tl1e otherv terminal plate being inclined toward the contact spring,

means on the other of said terminal plates; for holding and an opening for releasing the" contact spring insulation on the inclined terminal plate to prevent premature contact .by the said contact spring, and'means for operating the -contact spring. p 2. In a push button electric switch, a base member, a switch mechanism comprising terminal plates mounted upon the base memher, a contact spring having an enlarged J 1 m GRUND, free end portion secured I to one of said IOZRL Gnonn.

W itncsses 2 Copies of 'thi slpatentmay be obtained for five cents each, by addressing the Commissioner Patentis,

Washington, D. G. 

